<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8" />
  <title>Love</title>
  <style type="text/css">
    body {
      margin: 0;
      overflow: hidden;
      background: #000;
    }

    canvas {
      position: absolute;
      width: 100%;
      height: 100%;
    }

    #pinkboard {
      animation: anim 1.5s ease-in-out infinite;
      -webkit-animation: anim 1.5s ease-in-out infinite;
      -o-animation: anim 1.5s ease-in-out infinite;
      -moz-animation: anim 1.5s ease-in-out infinite;
    }

    @keyframes anim {
      0% {
        transform: scale(0.8);
      }

      25% {
        transform: scale(0.7);
      }

      50% {
        transform: scale(1);
      }

      75% {
        transform: scale(0.7);
      }

      100% {
        transform: scale(0.8);
      }
    }

    @-webkit-keyframes anim {
      0% {
        -webkit-transform: scale(0.8);
      }

      25% {
        -webkit-transform: scale(0.7);
      }

      50% {
        -webkit-transform: scale(1);
      }

      75% {
        -webkit-transform: scale(0.7);
      }

      100% {
        -webkit-transform: scale(0.8);
      }
    }

    @-o-keyframes anim {
      0% {
        -o-transform: scale(0.8);
      }

      25% {
        -o-transform: scale(0.7);
      }

      50% {
        -o-transform: scale(1);
      }

      75% {
        -o-transform: scale(0.7);
      }

      100% {
        -o-transform: scale(0.8);
      }
    }

    @-moz-keyframes anim {
      0% {
        -moz-transform: scale(0.8);
      }

      25% {
        -moz-transform: scale(0.7);
      }

      50% {
        -moz-transform: scale(1);
      }

      75% {
        -moz-transform: scale(0.7);
      }

      100% {
        -moz-transform: scale(0.8);
      }
    }

    #name {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      margin-top: -20px;
      font-size: 46px;
      color: #ea80b0;
    }
  </style>
</head>

<body>
  <canvas id="pinkboard"></canvas>
  <!-- <div id="name">洋子 ❤️</div> -->
  <canvas id="canvas"></canvas>

  <script type="text/javascript">
    const colors = [
      "#eec996",
      "#8fb7d3",
      "#b7d4c6",
      "#c3bedd",
      "#f1d5e4",
      "#cae1d3",
      "#f3c89d",
      "#d0b0c3",
      "#819d53",
      "#c99294",
      "#cec884",
      "#ff8e70",
      "#e0a111",
      "#fffdf6",
      "#cbd7ac",
      "#e8c6c0",
      "#dc9898",
      "#ecc8ba",
    ]; //用来设置的颜色
    var canvas = document.getElementById("canvas");
    var ctx = canvas.getContext("2d");
    let count = 1;

    var ww = window.innerWidth;
    var wh = window.innerHeight;

    var hearts = [];

    function init() {
      requestAnimationFrame(render);
      canvas.width = ww;
      canvas.height = wh;
      for (var i = 0; i < 100; i++) {
        hearts.push(new Heart());
      }
    }

    function Heart() {
      this.x = Math.random() * ww;
      this.y = Math.random() * wh;
      this.opacity = Math.random() * 0.5 + 0.5;
      this.vel = {
        x: (Math.random() - 0.5) * 4,
        y: (Math.random() - 0.5) * 4,
      };
      this.targetScale = Math.random() * 0.15 + 0.02;
      this.scale = this.targetScale * Math.random();
    }

    Heart.prototype.update = function (i) {
      this.x += this.vel.x;
      this.y += this.vel.y;

      this.scale += (this.targetScale - this.scale) * 0.01;
      if (this.x - this.width > ww || this.x + this.width < 0) {
        this.scale = 0;
        this.x = Math.random() * ww;
      }
      if (this.y - this.height > wh || this.y + this.height < 0) {
        this.scale = 0;
        this.y = Math.random() * wh;
      }
      this.width = 473.8;
      this.height = 408.6;
    };
    var url = document.location.toString(); //获取url地址
    var urlParmStr = url.slice(url.indexOf('?') + 1); //获取问号后所有的字符串
    var arr = urlParmStr.split('&'); //通过&符号将字符串分割转成数组
    var courseId = arr[0].split("=")[1]; //获取数组中第一个参数
    // var unit_title=arr[1].split("=")[1];//第二个参数
    unit_title=decodeURI(courseId);//转码将解码方式unscape换为decodeURI，将中文参数获取
    // console.log(unit_title);
    console.log(unit_title);
    //get请求
    var xmlhttp = new XMLHttpRequest();
    // get方法带参数是将参数写在url里面传过去给后端
    xmlhttp.open("GET", `http://192.168.1.200:8080/php/test.php?name=${unit_title}`, true);
    xmlhttp.setRequestHeader("token", "header-token-value");
    // xmlhttp.setRequestHeader("dingyi", "header-dingyi-value");
    xmlhttp.send();
    // readyState == 4 为请求完成，status == 200为请求陈宫返回的状态
    xmlhttp.onreadystatechange = function () {
      if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
        console.log(xmlhttp.responseText);
      }
    }
    Heart.prototype.draw = function (i) {
      ctx.globalAlpha = this.opacity;
      ctx.font = `${180 * this.scale}px "微软雅黑"`;
      // ctx.font="20px";
      ctx.fillStyle = colors[i % 18];
      ctx.fillText(
        unit_title,
        this.x - this.width * 0.5,
        this.y - this.height * 0.5,
        this.width,
        this.height
      );
      // ctx.drawImage(
      //   heartImage,
      //   this.x - this.width * 0.5,
      //   this.y - this.height * 0.5,
      //   this.width,
      //   this.height
      // );
    };

    function render() {
      ctx.clearRect(0, 0, ww, wh);
      // ctx.globalAlpha = 1;
      // ctx.fillStyle = "rgba(255,255,255,0.3)";
      // ctx.fillRect(0, 0, ww, wh);
      for (var i = 0; i < 100; i++) {
        hearts[i].update(i);
        hearts[i].draw(i);
      }
      requestAnimationFrame(render);
    }
    init();

    // var heartImage = new Image();
    // heartImage.onload = init();
    // heartImage.src =
    //   "";

    window.addEventListener("resize", function () {
      ww = window.innerWidth;
      wh = window.innerHeight;
    });
  </script>
  <script>
    /*
     * Settings
     */
    var settings = {
      particles: {
        length: 500, // maximum amount of particles
        duration: 2, // particle duration in sec
        velocity: 100, // particle velocity in pixels/sec
        effect: -0.75, // play with this for a nice effect
        size: 30, // particle size in pixels
      },
    };

    /*
     * RequestAnimationFrame polyfill by Erik M?ller
     */
    (function () {
      var b = 0;
      var c = ["ms", "moz", "webkit", "o"];
      for (var a = 0; a < c.length && !window.requestAnimationFrame; ++a) {
        window.requestAnimationFrame = window[c[a] + "RequestAnimationFrame"];
        window.cancelAnimationFrame =
          window[c[a] + "CancelAnimationFrame"] ||
          window[c[a] + "CancelRequestAnimationFrame"];
      }
      if (!window.requestAnimationFrame) {
        window.requestAnimationFrame = function (h, e) {
          var d = new Date().getTime();
          var f = Math.max(0, 16 - (d - b));
          var g = window.setTimeout(function () {
            h(d + f);
          }, f);
          b = d + f;
          return g;
        };
      }
      if (!window.cancelAnimationFrame) {
        window.cancelAnimationFrame = function (d) {
          clearTimeout(d);
        };
      }
    })();

    /*
     * Point class
     */
    var Point = (function () {
      function Point(x, y) {
        this.x = typeof x !== "undefined" ? x : 0;
        this.y = typeof y !== "undefined" ? y : 0;
      }
      Point.prototype.clone = function () {
        return new Point(this.x, this.y);
      };
      Point.prototype.length = function (length) {
        if (typeof length == "undefined")
          return Math.sqrt(this.x * this.x + this.y * this.y);
        this.normalize();
        this.x *= length;
        this.y *= length;
        return this;
      };
      Point.prototype.normalize = function () {
        var length = this.length();
        this.x /= length;
        this.y /= length;
        return this;
      };
      return Point;
    })();

    /*
     * Particle class
     */

    var Particle = (function () {
      function Particle() {
        this.position = new Point();
        this.velocity = new Point();
        this.acceleration = new Point();
        this.age = 0;
      }
      Particle.prototype.initialize = function (x, y, dx, dy) {
        this.position.x = x;
        this.position.y = y;
        this.velocity.x = dx;
        this.velocity.y = dy;
        this.acceleration.x = dx * settings.particles.effect;
        this.acceleration.y = dy * settings.particles.effect;
        this.age = 0;
      };
      Particle.prototype.update = function (deltaTime) {
        this.position.x += this.velocity.x * deltaTime;
        this.position.y += this.velocity.y * deltaTime;
        this.velocity.x += this.acceleration.x * deltaTime;
        this.velocity.y += this.acceleration.y * deltaTime;
        this.age += deltaTime;
      };
      Particle.prototype.draw = function (context, image) {
        function ease(t) {
          return --t * t * t + 1;
        }
        var size = image.width * ease(this.age / settings.particles.duration);
        context.globalAlpha = 1 - this.age / settings.particles.duration;
        context.drawImage(
          image,
          this.position.x - size / 2,
          this.position.y - size / 2,
          size,
          size
        );
      };
      return Particle;
    })();

    /*
     * ParticlePool class
     */
    var ParticlePool = (function () {
      var particles,
        firstActive = 0,
        firstFree = 0,
        duration = settings.particles.duration;

      function ParticlePool(length) {
        // create and populate particle pool
        particles = new Array(length);
        for (var i = 0; i < particles.length; i++)
          particles[i] = new Particle();
      }
      ParticlePool.prototype.add = function (x, y, dx, dy) {
        particles[firstFree].initialize(x, y, dx, dy);

        // handle circular queue
        firstFree++;
        if (firstFree == particles.length) firstFree = 0;
        if (firstActive == firstFree) firstActive++;
        if (firstActive == particles.length) firstActive = 0;
      };
      ParticlePool.prototype.update = function (deltaTime) {
        var i;

        // update active particles
        if (firstActive < firstFree) {
          for (i = firstActive; i < firstFree; i++)
            particles[i].update(deltaTime);
        }
        if (firstFree < firstActive) {
          for (i = firstActive; i < particles.length; i++)
            particles[i].update(deltaTime);
          for (i = 0; i < firstFree; i++) particles[i].update(deltaTime);
        }

        // remove inactive particles
        while (
          particles[firstActive].age >= duration &&
          firstActive != firstFree
        ) {
          firstActive++;
          if (firstActive == particles.length) firstActive = 0;
        }
      };
      ParticlePool.prototype.draw = function (context, image) {
        // draw active particles
        if (firstActive < firstFree) {
          for (i = firstActive; i < firstFree; i++)
            particles[i].draw(context, image);
        }
        if (firstFree < firstActive) {
          for (i = firstActive; i < particles.length; i++)
            particles[i].draw(context, image);
          for (i = 0; i < firstFree; i++) particles[i].draw(context, image);
        }
      };
      return ParticlePool;
    })();

    /*
     * Putting it all together
     */
    (function (canvas) {
      var context = canvas.getContext("2d"),
        particles = new ParticlePool(settings.particles.length),
        particleRate =
        settings.particles.length / settings.particles.duration, // particles/sec
        time;

      // get point on heart with -PI <= t <= PI
      function pointOnHeart(t) {
        return new Point(
          160 * Math.pow(Math.sin(t), 3),
          130 * Math.cos(t) -
          50 * Math.cos(2 * t) -
          20 * Math.cos(3 * t) -
          10 * Math.cos(4 * t) +
          25
        );
      }

      // creating the particle image using a dummy canvas
      var image = (function () {
        var canvas = document.createElement("canvas"),
          context = canvas.getContext("2d");
        canvas.width = settings.particles.size;
        canvas.height = settings.particles.size;
        // helper function to create the path
        function to(t) {
          var point = pointOnHeart(t);
          point.x =
            settings.particles.size / 2 +
            (point.x * settings.particles.size) / 350;
          point.y =
            settings.particles.size / 2 -
            (point.y * settings.particles.size) / 350;
          return point;
        }
        // create the path
        context.beginPath();
        var t = -Math.PI;
        var point = to(t);
        context.moveTo(point.x, point.y);
        while (t < Math.PI) {
          t += 0.01; // baby steps!
          point = to(t);
          context.lineTo(point.x, point.y);
        }
        context.closePath();
        // create the fill
        context.fillStyle = "#ea80b0";
        context.fill();
        // create the image
        var image = new Image();
        image.src = canvas.toDataURL();
        return image;
      })();

      // render that thing!
      function render() {
        // next animation frame
        requestAnimationFrame(render);

        // update time
        var newTime = new Date().getTime() / 1000,
          deltaTime = newTime - (time || newTime);
        time = newTime;

        // clear canvas
        context.clearRect(0, 0, canvas.width, canvas.height);

        // create new particles
        var amount = particleRate * deltaTime;
        for (var i = 0; i < amount; i++) {
          var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());
          var dir = pos.clone().length(settings.particles.velocity);
          particles.add(
            canvas.width / 2 + pos.x,
            canvas.height / 2 - pos.y,
            dir.x,
            -dir.y
          );
        }

        // update and draw particles
        particles.update(deltaTime);
        particles.draw(context, image);
      }

      // handle (re-)sizing of the canvas
      function onResize() {
        canvas.width = canvas.clientWidth;
        canvas.height = canvas.clientHeight;
      }
      window.onresize = onResize;

      // delay rendering bootstrap
      setTimeout(function () {
        onResize();
        render();
      }, 10);
    })(document.getElementById("pinkboard"));
  </script>
</body>

</html>